Sliding gage of precision



J. B. BOURGET.

SLlDlNG GAGE 0F PRECISION.

APPLICATION HLEn'MAY1a,1919.

1,334,984. vPatented Mar. 30, 1920i Cil UNITED sTATns PATENT onnion.

JEAN BAPTISTE BURGET, PARIS, FRANCE.

sninin'seinen er fascisten.

mattei.

Application filed May 13, 1319.

To all wlw/u t may concern.'

lle it known that l, JEAN BAPTurrn ,Boun- GET, a citizen oit t-he French Republic, resid ing at Paris, France, have invented cert-ain new and useful` Improvements in Sliding; (lanes oi: Precision, ot which the followingl is a specilication.

ln order that sliding gages o precision shall retain their accuracy even atter long use, it is absolutely necessary that the li'o'|.- lowing two conditions shall be observed l. There inust not be the slightest slacic ness between the graduated beam and the vernier slide.

Q. The sliding' motion `ot the slide alone` the graduated beam must always be very smooth and take place without excessive friction or annning.

Sliding gages have already been coinstrurted wherein the slaclfness oit `the slide in the direction of the width ot the beani can Zbe taken up in part as it occurs `by means ot a single small flat strip interposed between the edge olf the graduated beam (oit rectangular cross section and the corresponding' surface o1" the slide, farthest 'troni the side where the pressure ot the lingger ot the user is applied in adjusting the slide. This sinall strip may be clamped incre or less tightly against the edge of the beam by nieans of set screws. That arrangement liowever allows ot taking` up onlvv the lateral slarlness oli the slide, and does-not allow at all of taking up the slackness in the direction ot the depth ot the beani, while inereover the said pressure oi the linger which a ets always at one and the saine point at the end ot the slide, produces at last an irregular wear ot' the slide whereby the axis ol. the said slide gets out ot line with the axis oit the beam. rThe result is that the readings oi the vernier are inaccurate; and the openingi between the jaws becomes Haring; and the sliding" motion ot the slide becomes hard.

Those drawbacks cannot be obviated b v the use ot a regulating ineans comprising; only a. single iiat strip located on the sidey farthest from that on which the pressure oit the hand oi the user is applied.

The presen-t invention has for its object to provide an improved sliding which has none ciV the drawllnu'fks nientioned above.

The regulation for taking up the wear ot the slide on the side where the pressure of the linger ot the user is applied, is effected Specification. of Letters Patent.

I atented Mar. 30, 1920.

Serial No. 296,837.

A constructional example ot an ilnprowd` sliding' gage according to this invention is illustrated by way ot example in thev acronlpanying drawings in which Figure l is a4 plan and a cross section on the line. ril-ll ot the complete sliding` gage, viewed t'roln uinlerneath. that is to sav, troni the tace opposite the one that is niarlred with the graduations ot thevernier.

Fig'. 2 a section on the line Chl) ot Figi'. l.

Fig. 3 is a perspective View ot the slide, the adjustable strips having" been removed.

Fig'. et is an external view and sertions on the lines E--lf and (tml-l' ot one ot the adjustaliile strips.

its shown the improved sliding' :gane is constructed as t'ollows The graduated beain l has a trapezoidal torni in cross section, the edges of which are constituted by the two beveled surfaces 2 and 3.

The beam has a fixed jaw 4t.

The slide 5 is adapted to slide along the beain l; it has a jaw 6 (hereinafter called the sliding1 jaw). The slide 5 is provided on its upper tace (not visible in the ligure) with the usual vernici' scale. The 'internal section of the slide is of rectangular shape. and 8 are strips interposed between the shorter sides of the slide and the bevel surn faces 2 and 3 ot the beam. These strips have a straight outer edge and :in inner edge that is beveled to correspond to the bevel oi the beam. The pressure ot these strips against the bea-rn l is regulated by inea/ns ot" screws 9; contact takinpi place only on the lateral faces 2 and 3 ot the beaiu and on its inner tace 2% whereas owing to the bevels of the bea-ni l, a free space 12 is lett between the upper `tace oit the beam and the corresponding' 'face of the slide.

The strips 7 and 8 terminate at one end (Fig. Il) in a nose l() that engages in a suitable notch ll in the slide. At their other ends the strips are provided with a stud 13 that engages in a corresponding hole le in the slide.

(This stud may be replaced by a nose similar to the nose 10 at the opposite end). This arrangement is designed to prevent any longitudinal movement of the strips. 15 is a set screw for fixing the slide on the beam.

By suitably operating the four screws 9, a-ny slackness that may have been produced, can be taken up, and the axis of the slide and the axis of the beam can be maintained in line with each other, the sliding movement of the slide along the beam being always smooth with gentle friction and without risk of jamming.

The improved sliding gage has likewise the advantage of very great constructional simplicity, because there is no need to seek to obtain a lateral adjustment of the slide as exact as in other sliding gages because this adjustment is produced by the regulation of two strips. The consequence is a considerable saving in labor in manufacture.

What I claim is 1. A device 1of the character described comprising a graduated scale havingbeveled edges, a slide sliding o-n the scale, and two regulatable strips interposed from one side to the other between the slide and the beveled edges of the scale and themselves having interior beveled edges corresponding to the bevels of the scale so that the pressure of the strips on the scale will have the result of providing a free space between the scale and the corresponding face of the slide.

2; In a sliding gage, the combination of a producing a free space between said beam f and the corresponding face of said slide, screws for adjusting the location of said strips relatively to said beam, and a set screw 'for ixing said slide on said beam.

8. In a sliding gage, the combination of f a graduated beam having beveled edges, a slide having a rectangular groove slidablc along said beam, two adjustable strips located one on each side between said slide and said beveled edges of said beam, having each an unbeveled straight outer edge and an inner edge beveled to correspond to the bevel of said beam, whereby the pressure of the said strips upon said beam has the effect of producing a free space between said beam and the corresponding face of said slide, said strips being each formed at one end with a nose and at the opposite end with a, stud engaging in mortises in said slide; screws for adjusting the location ot said strips relatively to said beam, and a set screw for fixing said slide on said beam.

In testimony whereof I have signed my .name to this specification.

JEAN BAPTISTE BOURGET. 

